Those Who Can't

How is it possible for a professional repair centre to spend a fortnight on a job they themselves designated as "Skill Level 0"? How is it possible for an established company to manufacture a video recorder that, nine times out of ten, cannot record and, when told to rewind, actually fast-forwards for a few monents and then turn itself off? What gross degree of uselessness could cause Sky to install a sattelite dish in such a way that it allows rainwater to run down the cable and into the back of the decoder box, and then replace it later with a second dish that cuts out when the first cloud appears? How can a group of thirteen-year-old Scouts take an hour to take down a tent and twice as long to cook a simple fried breakfast? How can an experienced physics teacher manage to lose a piece of coursework and not notice until the day before it has to be sent for moderation? And how, in God's name, can I somehow contrive to soak myself thoroughly every single time I attempt to rinse out my toothbrush?